Abstract: A twin-lens projection display includes a dichroic synthesizing prism and an optical path compensating prism. First and second light modulators, which are disposed adjacent to first and second input sides of the dichroic synthesizing prism, provide modulated first and second color components to the same. A third light modulator is disposed adjacent to an input side of the optical path compensating prism, and provides a modulated third color component thereto. A first projection lens receives the first and second color components from an output side of the dichroic synthesizing prism, whereas a second projector lens receives the third color component from an output side of the optical path compensating prism.

Abstract: A projection display includes a light source for generating a beam output that contains first, second and third color components, a color separation/synthesizing prism unit having a color separation part for separating the beam output from the light source into the first, second and third color components that exit the prism unit in three different directions, and first, second and third light modulators for modulating the first, second and third color components that exit from the color separation part. The prism unit further has a color synthesizing part that receives the modulated first, second and third color components from the light modulators and that synthesizes the modulated first, second and third color components so as to form an output beam. A projection lens receives the output beam from the color synthesizing part, and is used to project a color image. The first, second and third color components have equal optical path lengths measured from the light source to the respective light modulator.

Abstract: In a projection display, a dichroic beam splitter separates white light into a first color set that includes first and second color components, and a second color set that includes a third color component, such that the first color set traverses an optical path different from that of the second color set. A first light polarization selector receives the first color set from the dichroic beam splitter, and a first polarized beam splitter prism receives the first color set from the first light polarization selector. The first polarized beam splitter prism directs the color components in the first color set to first and second light modulators respectively for light modulation. The first and second light modulators reflect the light-modulated color components of the first color set back to the first polarized beam splitter prism for reception by a second light polarization selector and a first projection lens.

Abstract: An illuminating apparatus includes a plurality of light members spaced apart from each other and operable so as to produce forwardly directed parallel light rays, a parabolic reflector disposed in front of the light members for receiving the forwardly directed parallel light rays from the light members, and an integrator unit. The parabolic reflector has a reflecting surface that confronts the light members. The integrator unit has an input side to receive the light rays reflected by the reflecting surface of the parabolic reflector.

Abstract: An LCD projector of two-plate type is disclosed. The LCD projector comprises a light source, a color valve, a dichroic mirror, a polarization rotating device, a polarization beam splitter, a first reflective LCD panel, a second LCD panel and a projection lens. The first reflective LCD panel is used to modulate the green light with the green component of the image signal. The red light and the blue light are modulated in a time field sequential manner by the color valve and the second reflective LCD panel.

Abstract: A projection display is used to process a light beam that includes first, second and third color components and that is to be provided to a projection lens. The projection display includes a dichroic beam splitter which separates the first color component from the second and third color components. A first polarization beam splitter prism cooperates with a first reflective light valve to process the first color component. A second polarization beam splitter prism cooperates with second and third reflective light valves to process the second and third color components. A third polarization beam splitter prism is disposed so as to direct the processed color components from the first and second polarization beam splitter prisms to the projection lens.

Abstract: A triple-lens type projection display includes a source for generating a white primary beam output, a first beam splitter for splitting the white primary beam output into a first color component and a secondary beam output, a second beam splitter for splitting the secondary beam output into a second color component and a third color component, first, second and third light modulators for modulating the first, second and third color components, respectively, a first projection lens for receiving the first color component from the first light modulator, a second projection lens for receiving the second color component from the second light modulator, and a third projection lens for receiving the third color component from the third light modulator. Each of the first, second and third color components has a respective optical path length that is measured from the first beam splitter to a respective one of the first, second and third light modulators.

Abstract: A wood floor board assembly includes a plurality of base plates, and a plurality of linking members. Each of the base plates has a front side provided with a rib and a rear side defining a recess. The rib has a bottom provided with a first snap portion. The recess has a bottom provided with a second snap portion. A contact portion is provided on a bottom of each of the base plates and located between the first snap portion and the second snap portion. Each of the base plates has a left side provided with a third snap portion having an upward directed opening and a right side provided with a fourth snap portion having a downward directed opening. Each of the linking members has a front side defining a first fitting channel, a rear side defining a second fitting channel, and a mediate portion provided with an interface flange. Each of the front side and the rear side of the linking member is provided with a locking portion which extends inward and is inclined downward.

Abstract: An illumination device and an image projection apparatus having the same. The illumination device has a light source with multiple light emitting devices and an uniform illuminating means evenly distributed in front of the light source. The light emitted from the light source can thus uniformly project on a light valve. In addition, a polarization converter is used to convert the light into a usable polarization type, so as to increase the illumination efficiency. The image projection apparatus basically has three of the above mentioned illumination devices to emit three elementary color lights projecting onto a screen.

Abstract: An illumination device and an image display apparatus using the same. The illumination device comprising a light source, an illumination uniformizing device, and a polarization converter. The image display apparatus comprises an illumination device provided in the invention, a synthesizing means, and a projection means. The illumination uniformizing device has an incident plane for receiving a light emitted from the light source. Opposite the incident plane, a mirror is used as a side plane of the illumination uniformizing device to reflect the light coming from the incident plane. A bottom plane at a lower side and projection plane at an upper side of the incident plane are disposed between the incident plane and the side plane. A scattering pattern gradually condensed from the incident side toward the side plane is formed on the bottom plane, so that the light incident from the incident plane is made uniform.

Abstract: An image display is illuminated by a light source employing a plurality of low power light emitting devices. The lifetime and light intensity of the light sourceare increased by orders of magnitude. The illumination provided by the light source is made uniform to efficiently utilize the light source and so obtain optimum projection results.

Abstract: A wide-angle zoom lens includes four sets of lenses. The first set of lenses has a negative effective focal length. The second set of lenses has a positive effective focal length for changing the focal length of the wide-angle zoom lens. The third set of lenses has a negative effective focal length for changing the focal length of the wide-angle zoom lens, as well. The fourth set of lenses has a positive effective focal length. The focal length of the wide-angle zoom lens can be changed by changing the positions of the second set of lenses and the third set of lenses along the optical axis of the wide-angle zoom lens.

Abstract: A projection zoom lens having a long back focal length is provided which can produce excellent image quality.